<font color="green"> (sniff,sniff) My exhaust smells funny. That's the only difference I can tell running bio in my 2210. I was experimenting with Wesson cooking oil when fuel prices started climbing mixed up to 20% cooking oil in road diesel. I have since found a source for off-road bio diesel. Again, my smoke smells funny, that's all. Minnesota tried to push for 20% bio but recently passed mandatory 2% blend.</font>